OLED Display Device Photosensitive Pattern Layer Lateral Leakage
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience color changes in low grayscale due to lateral leakage in the organic emission layer, which affects image quality.
Innovation Solution
A display device design featuring a transistor on a substrate with a photosensitive pattern layer and an inorganic pattern layer, separated from the emission layer and electrodes, reduces lateral leakage by creating a reversed taper shape and using a bank layer to isolate the emission layer, thereby improving color accuracy in low grayscale conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic emission layer is extended to improve light emission area, then the brightness and coverage are improved, but lateral leakage occurs causing color change in low grayscale
Solution Approach 1:
The emission layer is segmented into multiple independent light emission parts (first light emission part, second light emission part, etc.) separated by charge generation layers. This segmentation prevents lateral leakage by creating isolated emission regions while maintaining overall brightness through coordinated operation of multiple segments.
Solution Approach 2:
Charge generation layers are introduced as intermediary structures between adjacent light emission parts. These intermediary layers generate charges that form potential barriers, preventing carrier diffusion and lateral leakage between neighboring emission regions, thus eliminating color change while preserving emission intensity.
2Manufacturing precision
If a pattern part is added to reduce lateral leakage, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The pattern part is merged with the electrode pattern layer, combining the leakage prevention function with the existing electrode structure. This integration reduces device complexity by eliminating separate components while maintaining color accuracy through the combined structural design.
Solution Approach 2:
The pattern part serves multiple functions: it acts as both an electrode pattern layer for electrical connection and a structural barrier against lateral leakage. This multi-functionality reduces the need for additional components, simplifying the overall device structure while achieving color accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces lateral leakage and prevents color changes in low grayscale, enhancing the image quality and stability of OLED displays.
Implementation Method 1
the pattern part includes a photosensitive pattern layer made of a photosensitive resin
Data Source
AI summary
A display device according to an embodiment includes a transistor positioned on a substrate; a first electrode electrically connected to the transistor; an emission layer positioned on the first electrode; a second electrode positioned on the emission layer; and a pattern part spaced apart from the first electrode. The pattern part includes a photosensitive pattern layer made of a photosensitive resin.